Update, September 25: As it turns out, that European Commission report found that piracy actually increased the number of legitimate sales of videogames.A European Commission report on the effect of piracy on the legitimate sales of films, TV, books, music, and games has found that, eventually,
I imagine a lot of people use piracy as a way to get a sort of demo of a game, especially as demos got more and more rare. Pirate a game play it for a while, and pay for it if you like it.